Improvement in car-springs



3 Sheets--Sheet 2.

Gv. FRANKLIN. Car Springs.

135,792f Patented Feb.11,1873.

FIG. 5

INVENT 0R.

WITNESSES I @mgm @Smm @mxke 6 if Mm 3 Shees--Sheet 3.

G. FRANKLIN. Gar Springs.

No,. 135,792. Patentedfeb. 11,1873.

WITNESSES NVENTOR AM. PHoroi/masfwmcca MKMSBURNE'SPRQCESs) UNITED STATES PATENT OFFICE.

GEURGE FRANKLIN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN CAR-SPRINGS.

Specification forming part cf Letters Pate-nt No. 135,792, dated February 1l, 1373.

of scrolls on their ends which interlock each other, as hereinafter described.

I usually incase the springs in a pair ot' castiron boxes, one of which slides over the other. The boxes may, howeveig'be dispensed with by connecting the springs with head-plates in any convenient manner.

Figure l is a vertical longitudinal section of a spring adapted for passengencars. Fig. 2 is a cross-section at the line a b of Fig. 1. Fig. Sheet No. 2, represents a vertical section of a spring for freight-cars. Fig. et is a section ot' a spring suitable for bumpers. Fig. 5 is an isometrical view of one of the plates A. Fig. 6, Sheet No. 3, is a like view of the box B.

Like letters in all the tignres indicate the same parts.

The plates A are constructed with a scroll, a, at one end, and a scroll, a', at the other end, the scroll a of each plate being of such dimensions that when driven into the scroll a of a contiguous end. ot another plate a tight and strong tit is made, so that when connected togetlger in zigzag form, as represented in the drawing, they shall operate in like manner as an elliptic or spiral spring. In Fig. 1 the middle plate ofthe series is represented longer than the others, which diminish 'in length each Way so as to act on the principle of an elliptical spring'. B B are cast-iron boxes, which incase the springs, there being cross-bolts (l C, which connect them. The ends of the bolts have a permanent connection with the sides c of the box B, and slide in the cross-grooves b in the sides c of the box B in the contraction and expansion ot' the spring. The spring' in Fig. 3 represents a spring suitable forv freight-cars. It is constructed like that rep resented in Figs. l and 2, with the exception that the plates A diminish in length one way, instead oi" each way'rom the center yof the spring. Fig. et represents a portion of' a bumper-spring, in which I make the plates A of equal length, there heilig a sufficient number ot plates to give the proper elasticity to the spring. The ends of the plates A may be connected by means of clamping-pieces inf stead ot' the scrolls, if desired.

I claim as my inventionl. A spring composed of plates A connected together at their ends, and arranged in zigzag' form to cause the spring to act in the manner of an elliptical or spiral spring, substantially as described.

2. The scrolls a and a on the ends of the plates A for connecting the latter together, substantially in the manner and for the pur pose set i'orth.

GEORGE FRANKLIN.

Witnesses:

'IHoMAs J. BEWLEY, STEPHEN UsrioK. 

